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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Estimation of the SAR system transfer function through processor defocus
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Estimation of the SAR system transfer function through processor defocus

机译:通过处理器散焦估计SAR系统传递函数

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摘要

It is generally accepted that in order to derive wave directional spectra from synthetic-aperture radar (SAR) image data, the system transfer function (STF) must be removed from the raw SAR image spectrum. The STF, very nearly equivalent to the magnitude of the Fourier transform of the N-look perfect-focus impulse response, can be estimated from actual SAR image data as the magnitude of the Fourier transform of the autocorrelation function of the speckle in a low-contrast scene. The authors outline and demonstrate a novel approach for estimating the STF based on the observation that system defocus, to the first order, does not impact speckle statistics.
机译:通常认为,为了从合成孔径雷达(SAR)图像数据中获得波向光谱,必须从原始SAR图像光谱中删除系统传递函数(STF)。 STF几乎等于N-look完美聚焦脉冲响应的傅立叶变换的幅度,可以根据实际SAR图像数据估算为低噪声下散斑自相关函数的傅立叶变换的幅度。对比场景。作者概述并演示了一种新的方法,用于基于系统散焦至一阶不会影响散斑统计的观察值来估计STF。

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